Tabby’s Star

http://www.astronomy.com/news/2019/09/evaporating-exomoon-could-explain-weird-light-patterns-of-tabbys-star

Apparently the riddle of Tabby’s Star has been solved, the weird light fluctuations (which aren’t due to alien megastructs, if they were we would only be seeing infrared due to waste heat emissions, instead the patterns are consistent with those of dust) are due to tidal disruptions of an icy exomoon of a planet orbiting Tabby’s Star. In other words, an exomoon is being shred to bits by the star itself and the resulting chaos is what’s causing the dimmings.

Similar explanations have been proposed for the other oddly dimming stars out there, just how common is this phenomenon of moonnapping?

Note that this is only preliminary, further research is needed, and that such a coincidence could explain these odd dimmings seems unlikely.

Population III stars and solar systems

On Usenet recently someone brought up the possibility of solar systems forming around Pop III stars even though, being huge, they would’ve lived only a few million years. Giant stars have short lifespans of only a few million years, a few tens of millions of years at most, and I am incredulous that any substantial planetary system could develop around stars with such short lifespans.

Pop III stars were the first stars in the universe, none are around today, and thus they’ve never been directly observed because they are so old. (They’ve been indirectly observed tho, including by means such as detecting supermassive black holes.) One is better off looking for solar systems around main sequence and dwarf stars, especially if one is looking for ones with life in them.

Said poster also brought up that only gas giants could’ve presumably been found orbiting Pop III stars, but I would like to point out that the cores of gas giants are still metallic, and so would’ve required heavy elements for the gas to accrete to, which would’ve existed long after the Pop III stars went supernova, since they would’ve lacked the heavier elements in their makeup necessary for even gas giants to form.